Zookeeper started script with some boilerplate stuff

zk_starter.bash

#!/bin/bash

set -u
set -e

trap _error_exit ERR

_error_exit()
{
        echo "ERROR EXIT"
        exit 1
}

# redirect STDERR to STDOUT
exec 2>&1

declare -r _hname=$(hostname)

_log ()
{
        local msg="$@"
        local dd=$(date +"%Y-%m-%d %H:%M:%S")

        echo "[$dd] [${_hname}] $msg"

        return 0
}

_startup_debug ()
{
        _log "########## DEBUG: BEGIN"
        env | sort
        _log "hostname [$(hostname)]"
        _log "uname [$(uname -a)]"
        _log "id [$(id -a)]"
        _log "########## DEBUG: END"

        return 0
}

### script starts here ###
zk_dir="$1"
conf_dir="$2"

/usr/bin/env | sort

_startup_debug

_log "zookeeperid [$ZOOKEEPER_ID]"

mkdir -p /var/lib/zookeeper

echo -n "$ZOOKEEPER_ID" > /var/lib/zookeeper/myid

set -x

./${zk_dir}/bin/zkServer.sh --config ./${conf_dir} start-foreground

# this point is never reached
_log "Done"